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Re: Possible bug in mkfs.ext3



The -S was advised by a member of the Fedora Users Mailing List,
and I thought I would try it.
I still have the original disk, so no permanent harm.
I keep trying what is suggested on a copy of the partition.

Only drag is the copying :)
It is a 400GiB partition (400 * 1024^3).

I am currently scanning the parition for a superblock, starting at -b 0,
and keep incrementing by 512, until I find what"might be" a superblock;
i.e. fsck does not say "Bad magic number". Of course, that's no guarantee
it is a superblock, but it gives me an opportunity to examine the superblock
at that offset.

Regards,

JD


On 09/20/2014 12:14 PM, Theodore Ts'o wrote:
On Fri, Sep 19, 2014 at 07:56:37PM -0600, jd1008 wrote:
I am reporting this on the advice of the Fedora Users Mailing List Member.

This the mailing list exchange outlining the problem with specifying -S to
mkfs,
and it's subsequent consequences when fsck is run.
If none of the possible superblocks are valid when using mke2fs -b
<NNN>, there's a good chance that your partition table (or LVM
metadata) has gotten corrupted.  You should definitely check to make
sure the partition setup is sane before trying to use mke2fs -S.

It's also true, as Andreas has stated, that with the large number of
new file system options and layouts with ext4, mke2fs -S is much more
hazardous unless you __really__ know what you are doing.  It would
probably be a good idea to have some warning messages to that effect
in the man page.

						- Ted



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